Sawada Tsunayoshi, Utterly Unremarkable

Blurb:

Sawada Tsunayoshi, male, 18 years old. Having won an award, he earned the opportunity to study in the UK. His academic performance was excellent, and his teachers adored him. After graduating, he landed an easy job and went straight to work, earning over ten thousand a month at a young age. His family was small, happy, and complete.

If there was one thing in his life that had gone wrong, would almost becoming the head of the largest mafia family in the underworld count?

These days, aside from occasionally teasing grade-schoolers and watching people play red versus black, he spends his time lying in the yard in a rocking chair sent over by the Chinese neighbors, sunning himself. He looks utterly at peace.

.

Then, in the time it takes to blink, ten years pass and the world changes.

A natural disaster not seen in 800 years looks at him as if he were headed to a funeral.

The “younger sister” who should have taken his place as the Tenth Generation Boss has mysteriously disappeared.

And his unreliable father has become nothing more than a grave.

Vongola Headquarters lies in ruins, and a certain white cotton-candy monster has once again raised the banner of “becoming the god of the new world.”

Even worse, the world is about to be destroyed again.

Sawada Tsunayoshi, former Tenth Generation Boss and current holder of the Moon's Authority and the Moon Holy Grail, says frankly, “My fists and my magic staff are insanely powerful now.”

“And call Chaldea for me!!! This is a Singularity, damn it!!!”

.

When you've lost everything, what do you have left?

If that's the case, why not welcome a new beginning?

While the Seven³ were busy noticing that they'd lost someone, the Root's Vortex next door had already welcomed a brand-new darling!

Now that's what I call sneaking in and stealing the whole house before they know it.

*The trope becomes obsolete once the Mary Sue invasion succeeds.

*Trying to write a little about Tsunayoshi becoming a magus.

Theme: Make every day shine.